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perf json: Pipe mode --to-json support

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In pipe mode the environment may not be fully initialized so be robust
to fields being NULL. Add default handling of feature and attr events.

Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Derek Foreman <derek.foreman@collabora.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@linaro.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Ian Rogers 2026-02-10 17:52:39 -08:00 • committed by Arnaldo Carvalho de Melo
parent 8772598b78
commit 6db2f7c67b
1 changed files with 16 additions and 0 deletions
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16
tools/perf/util/data-convert-json.c
View file

@ -48,6 +48,9 @@ struct convert_json {
static void output_json_string(FILE *out, const char *s)
{
fputc('"', out);
if (!s)
goto out;
while (*s) {
switch (*s) {
@ -71,6 +74,7 @@ static void output_json_string(FILE *out, const char *s)
++s;
}
out:
fputc('"', out);
}
@ -322,6 +326,16 @@ static void output_headers(struct perf_session *session, struct convert_json *c)
output_json_format(out, false, 2, "]");
}
static int process_feature_event(const struct perf_tool *tool __maybe_unused,
struct perf_session *session,
union perf_event *event)
{
if (event->feat.feat_id < HEADER_LAST_FEATURE)
return perf_event__process_feature(session, event);
return 0;
}
int bt_convert__perf2json(const char *input_name, const char *output_name,
struct perf_data_convert_opts *opts __maybe_unused)
{
@ -360,6 +374,8 @@ int bt_convert__perf2json(const char *input_name, const char *output_name,
c.tool.auxtrace_info = perf_event__process_auxtrace_info;
c.tool.auxtrace = perf_event__process_auxtrace;
c.tool.event_update = perf_event__process_event_update;
c.tool.attr = perf_event__process_attr;
c.tool.feature = process_feature_event;
c.tool.ordering_requires_timestamps = true;
if (opts->all) {